Grammarly
An AI writing assistant that catches errors, adjusts tone, and rewrites text across the tools your team already uses.
Independent overview by new Mantra · updated July 3, 2026
- Category
- Operations
- Pricing
- $12/mo Pro (annual, $144/yr) or $30/mo monthly
- Implementation
- Under 1 week
- Adoption risk
- Low
- Integrates with
- Microsoft Word, Google Docs, Gmail, Slack, Chrome
What Grammarly does
Grammarly sits inside the apps your team writes in every day — Gmail, Slack, Google Docs, Microsoft Word, and Chrome — and flags grammar and spelling mistakes as they happen. It also suggests ways to tighten sentences, shift tone to match the situation, and rewrite full paragraphs when clarity is the problem.
The Pro tier adds sentence rewrites, tone adjustment, brand voice controls, and a larger pool of AI-generation prompts. A free tier exists with more limited features, so staff can try it before the business commits to paid seats.
Grammarly states it does not sell or share user content for advertising and does not allow third-party providers to train models on that content — a practical consideration for businesses handling sensitive internal communications.
Key capabilities
Grammar and spelling checks
Grammarly reviews text for grammar, spelling, punctuation, and structure in real time as you write, without requiring you to switch to a separate tool.
Tone and style suggestions
The tool identifies the tone of a piece of writing and offers suggestions to adjust it — for example, making a customer message sound more confident or a team update more concise.
Full sentence and paragraph rewrites
On the Pro plan, Grammarly can rewrite entire sentences or paragraphs with one click, which is useful when a draft is structurally unclear rather than just misspelled.
Brand voice and style guide
Teams can set brand tone preferences so that suggestions stay consistent with how the organisation wants to communicate, rather than defaulting to generic phrasing.
Works inside existing apps
Grammarly integrates directly with Microsoft Word, Google Docs, Gmail, Slack, and Chrome, so there is no separate writing environment to learn or switch to.
AI detection and content review
Grammarly includes an AI Detector agent that can flag text that appears to be AI-generated, which may be useful for teams reviewing externally submitted content.
Best for
- Teams that produce a high volume of written communication — emails, reports, support replies, internal updates — and want to reduce time spent on editing and review.
- Small to mid-sized businesses that need a low-effort rollout: implementation is estimated at under one week and the tool layers onto software staff already use.
- Organisations where writing quality varies across the team and a consistent, on-brand tone matters for customer-facing output.
- Individual contributors or managers who write frequently but don't have access to a dedicated editor or communications support.
- Businesses in any industry — the tool is general-purpose and not built for a specific vertical.
Worth knowing
- Sentence rewrites, tone controls, and brand voice features are only available on the Pro plan at $12 per member per month (billed annually) or $30 month-to-month. The free tier is limited and may not meet most business needs on its own.
- Costs scale per seat, so for larger teams the annual spend can become significant — worth modelling before rolling out broadly.
- The tool improves writing that already exists; it is not a content strategy or document management solution, and will not help teams decide what to write or how to structure processes around writing.
- Staff whose daily work involves little written communication are unlikely to get meaningful value from a paid seat.
- If your organisation needs deep integration with proprietary internal systems or handles highly regulated content with strict data-residency requirements, the Enterprise plan and its security details would need closer scrutiny before proceeding.
Related tools
Ready to see Grammarly in action?
Not sure where to start? Our free assessment matches your workflow with the AI tool that fits.